---
id: CVE-2026-46158
title: 'mptcp: pm: ADD_ADDR rtx: always decrease sk refcount'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

  When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer().
  It should then be released in all cases at …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    f5555a6d7c472849fdf2b426e3d0a85103118793
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    e9ba34301d2e90f63f97c76ad9eb98e5250fe961
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    81d8142148164176385c279c7c1e1d581867423d
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    9426265e157dd77ec237c795901ed4dea6d69b5c
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    b41dd76f3b9735096c21d3e799a2b9fe36498d57
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    acd3d3562315c99f3c0db16f0fcc5f0306638982
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    25e37407442b8766ec2cf52fb4e31b5c3d3aeeae
  - >-
    Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 <
    9634cb35af17019baec21ca648516ce376fa10e6
  - Linux 5.10
published: '2026-05-28'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T11:58:23.714Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-46158'
references:
  - url: 'https://git.kernel.org/stable/c/f5555a6d7c472849fdf2b426e3d0a85103118793'
  - url: 'https://git.kernel.org/stable/c/e9ba34301d2e90f63f97c76ad9eb98e5250fe961'
  - url: 'https://git.kernel.org/stable/c/81d8142148164176385c279c7c1e1d581867423d'
  - url: 'https://git.kernel.org/stable/c/9426265e157dd77ec237c795901ed4dea6d69b5c'
  - url: 'https://git.kernel.org/stable/c/b41dd76f3b9735096c21d3e799a2b9fe36498d57'
  - url: 'https://git.kernel.org/stable/c/acd3d3562315c99f3c0db16f0fcc5f0306638982'
  - url: 'https://git.kernel.org/stable/c/25e37407442b8766ec2cf52fb4e31b5c3d3aeeae'
  - url: 'https://git.kernel.org/stable/c/9634cb35af17019baec21ca648516ce376fa10e6'
tags:
  - cve.org
epss: 0.00128
epssPercentile: 0.02808
ingestedAt: '2026-09-14T15:23:07.458Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer().
It should then be released in all cases at the end.

Some (unlikely) checks were returning directly instead of calling
sock_put() to decrease the refcount. Jump to a new 'exit' label to call
__sock_put() (which will become sock_put() in the next commit) to fix
this potential leak.

While at it, drop the '!msk' check which cannot happen because it is
never reset, and explicitly mark the remaining one as "unlikely".

## Affected

- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < f5555a6d7c472849fdf2b426e3d0a85103118793`
- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < e9ba34301d2e90f63f97c76ad9eb98e5250fe961`
- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < 81d8142148164176385c279c7c1e1d581867423d`
- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < 9426265e157dd77ec237c795901ed4dea6d69b5c`
- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < b41dd76f3b9735096c21d3e799a2b9fe36498d57`
- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < acd3d3562315c99f3c0db16f0fcc5f0306638982`
- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < 25e37407442b8766ec2cf52fb4e31b5c3d3aeeae`
- `Linux >= 00cfd77b9063dcdf3628a7087faba60de85a9cc8 < 9634cb35af17019baec21ca648516ce376fa10e6`
- `Linux 5.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.